Statistics Chapter 1- Test 1

Statistics. Understandable Statistics
Created Sep 22, 2011
by mandystanley
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Side ASide B
A descriptive measure of a sample
statistic
method of organizing, summarizing, and presenting data
descriptive statistics
The group of all items of interest
population
the process of making an estimate. prediction, or decision about a population based on sample...
statistical inference
a set of data drawn from a population
sample
the data can be arranged in order & differences b/w data values are meaningful
interval scale
the data consists of names, labels, or categories. There are no criteria for ordering the data...
nominal scale
the data can be arranged in order & both & ratios b/w data values are meaningful. Also...
ratio scale
the data can be arranged in order. However, differences b/w data values either can;t be determined...
ordinal scale
The Requirements of a Random Sample
1. Each indiv. in population of interest must have an equal probability of being of being included...
Divide the entire population into pre-existing segments or clusters. The clusters are often...
Cluster sampling
Create a sample by using data from population members that are readily available.
Convenience Sampling
A simple random sample of n measurements from a population is a subset of the population...
Simple Random Sampling
Divide the entire population into distinct subgroups called strata. The strata are based on...
Stratified Sample
Number all members of the population sequentially. Then, from a starting point selected at...
Systematic sampling
A variable that describes an individual by placing the individual into a category or group,...
Qualitative variable
A quantitative variable has a value or numerical measurement for which operations such as addition...
Quantitative variable
numerical measure that describes an aspect of a population.
Parameter
Given a random sample of 9 skiers at Vail:18, 25, 32,16, 41, 52, 29, 58, 23Give the 5 number...
XMin= 16;  Q1= 20.5;  Med (Q2)= 29;  Q3= 46.5;  Xmax=58 Age of skiers
What is IQR and how do you find it?
Interquartile RangeQ3-Q1= 20.5
How do you find the sample mean?
Summation of X divided by n
How do you find the median?
Order the data and then find the physical middle; Position= (n+1)/2
How do you find the mode?
it is the most frequent
How to find Weighted Mean
Summation (Weight x Data) / Summation(Weight)
How do you find the Range?
Xmax - Xmin
How do you find the sample mean?
Summation(X) / n
How do you find the sample standard deviation?
fill in
Computational Formula (Standard Deviation)
fill in
Population Standard Deviation
fill in
Sample Variance
fill in
Population Variance
fill
Sample Mean for Grouped Data
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